Non-Lorentzian spectral functions for Coulomb quantum kinetics
Universität Rostock, FB Physik, Universitätsplatz 3, 18051 Rostock, Germany
2 Institut für Theoretische Physik, Universität Frankfurt, Robert-Mayer Strasse 8-10, 60054 Frankfurt, Germany
Published online: 15 May 1999
Numerical solutions of the Kadanoff-Baym equations with self-energies in second Born approximation are presented for electrons in a bulk semiconductor. The results are used to analyze in detail the two-time spectral function . In particular, (I) the damping of the spectral function is investigated over a broad density range both, for low and high temperatures; (II), is compared to analytical expressions -an exponential and a recently proposed inverse hyperbolic cosine decay law; (III), the two analytical spectral functions are studied with respect to conservation of total energy, where for the inverse hyperbolic cosine an improved behavior is demonstrated.
PACS: 05.20.Dd – Kinetic theory / 05.30.-d – Quantum statistical mechanics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999